It is said the each new acquisition is subject to various evil forces and jealousy. As a precautionary measure for this various safeguard ceremonies must be performed. Griha-Pravesh Puja is one such ceremony which is performed to conciliate with the gods and planets so that the inmates of the house are blessed with good fortune.
Ganesh-puja, Navagraha-puja (worship of the nine planets), and worship of the Vastu purusha should be performed. The residents of the building should then circumambulate the building. Then puja should be done to the threshold.